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A Boeing E-3G Airborne Warning and Control System aircraft on final approach to land June 16, 2017, Tinker Air Force Base, Oklahoma. The large building behind the E-3 AWACS is building 3001, a former Douglas Aircraft manufacturing plant during World War II, now used by the Oklahoma City Air Logistics Complex and its parent organization the Air Force Sustainment Center. The E-3 is operated by the 552nd Air Control Wing, Air Combat Command, from Tinker AFB where heavy maintenance of the E-3 airframe and engines is also conducted by the OC-ALC. (U.S. Air Force photo/Greg L. Davis)